Warm air heating furnace



May 16, 1933. o. F. NYSTROM WARM AIR HEATING FURNACE Filed March 14, 1929 INVENTOR dscar P /V 6/!0/17 ATTORNEYS Patented May 16, 1933 mare!) STATES PATENT GFFIQE ()SGAR IP. NYSTROM, OF HOLLAND, MICHIGAN, ASSIGNOR T HOLLAND FURNACE COMPANY, OF HOLLAND, MICHIGAN WARM AIR HEATING FURNACE Application filed March 14, 1929. Serial No. 346,855.

This invention relates to improvements in warm air heating furnaces.

The objects of the invention are: p

First, to provide an improved fan and.

distribution structure for warm air heating furnaces.

Second, to provide an improved fan structure for such a furnace.

Third, to provide improved electrically 0 driven structures of special construction to insure substantially silent operation.

Fourth, to provide an improved fan support for such a structure. a

Fifth, to provide improved lubricating means for such a fan structure.

,Objects pertaining to details will appear from the description to follow. A preferred form of my invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a detail vertical central elevation view, taken on irregular line 11 of Fig. 2, through the upper part of a furnace and its casing with my improved fan structure, the fan and electric motor and other parts being indicated in full lines.

Fig. 2 is a detail plan viewof the driving motor and the driven fan pulley in position on the top of the furnace.

0 Fig. 3 is an enlarged detail sectional view through the pivotal cushion electric motor support taken on line 33 of Figs. 2 and 4.

Fig. 4 is an enlarged detail plan view of the cushion motor support detached from the top of the furnace.

Fig. 5 is a detail elevation view of the electric motor and its pivotal support from the right hand side of Fig. 1.

The parts will be identified by theirnumorals of reference which are the same in all the views.

1 is the furnace, the top of the radiatoronly appearing. 2 is the furnace casing, the upper part only being illustrated, the air 4 intake at the bottom being of usual construction is not illustrated. 3 is the breast casing top inclined inwardly on all sides. 4 is the conically depressed center of the top. 5 are the warm air pipes leading off in the usual manner.

At the top of the furnace casing and under the breast for the attachment of the pipes, I provide a conically formed annular partition 6 of sheet metal suitably secured at the top joint of the furnace, or this part may be separated in any suitable manner to form an annular chamber within the casing top outside the fan.

I provide a reinforcing inverted supporting cone 41 which rests within and on top of the conically depressed top 4. Within the top of the furnace I dispose the fan 7 carried on its vertical spindle 8 which is provided with a driven pulley 9. I provide a bearing 10 having an annular cup 101 and with a central journal part 102 shouldered at 103. The pulley 9 is provided with a hub 11 having a downwardly projecting cup 111 with a bearing surface to fit the ournal 102. This is flanged at the top at 112 fitting the outside of the bearing cup 101 to increase the bearing surface and protect the interior of the bearing. Oil is placed in the cup 101 which serves to lubricate the structure very thoroughly and secure a silent running hearing.

The motor 12 is secured to its supporting bracket 13, the usual construction of motor base, which is provided with projecting lugs 131, 132 which are perforated to receive the pivot pin support. A resilient base 14 is provided with a pivot pin 1 11 on which the motor pivots and the motor is put under spring tension by the spring 15 engaging projecting lug 14-2 on the base 14- and the outer edge of the bracket 13. The motor 12 is provided with double pulley 121 and drives the pulley 9 by the endless belt 122, the motor being kept under tension by the spring 15 as indicated.

The base 141 is resiliently supported on the sub-base plate 16, which plate is preferably bolted to the top plates 4 and 41. Upwardly projecting cap screws 161 are secured to this base plate 16 and coil springs 162 and 163 are disposed on the cap screws 161 above and below the base 1a. The apertures through the base 14: are of such size that the cap screws 161 do not contact with the same, the base being thus entirely spring supported and capable of being leveled by the adjustment of the screws 161. As a result the electric motor 12 is entirely resil iently supported. It yields to accommodate all irregularities that may be in the driving belt 122 which, as it is a smooth continuous belt, runs very smoothly under the tension provided.

The motor can be adjusted to the exact level and, being resiliently supported, it yields on its support without causing or imparting vibration to the furnace. It conse quently runs in a silent manner and, as a low speed is permissible, even the hum of the motor can be practically eliminated. It is highly desirable, of course, that this structure be silent in operation because if noise were occasioned it would be communicated to all parts of the building to which the pipes communicate.

In operation it will be noted that the warm air from the furnace is brought centrally under the fan 7 which, because of the beveled form of the blades as seen in Fig. 1, carries the air upward and forwardly. The ends of the blades project the air out equally by centrifugal force into the annular chamber beyond the end of the fan where it is of necessity forced by substantially equal pressure outwardly through the whole series of warm air pipes leading from the furnace casing. Two such pipes are illustrated in the drawing but, of course, there are usually more than that, one being provided for each room in the house.

It is very common experience to find that, with pipes of equal size and apparently each located in the same favorable manner on the furnace, heat will be delivered adequately to one room and inadequately to another. My improved structure obviates all this by its auxiliary action, insuring a sufficiently high pressure at all points within the casing to overcome the differences in resistance within the warm air pipes themselves and effectively distribute the air in proper proportions which can be determined by the relative resistances and adjustment of the pipes accordingly.

The structure as here presented is of great advantage and results in great economy, the circulation of the air being very prompt and at once transferring the heat from the furnace to rooms or apartments being heated and thereby utilizing the same to the fullest extent without an undue waste of the heat in the basement where the furnace is installed.

The upper part of the furnace casing becomes a fan casing and the annular partition 6 becomes the lower part of the fan casing, its central aperture constituting the fan intake, so that the whole upper part of the furnace becomes a suction fan. structure drawing air up over the heating elements and distributing it radially outwardly into the warm air pipes.

The structure is available for use in warm weather and circulates air from the basement resulting in the cooling of the house. In this work the belt is adjusted on the larger diameter of the double pulley 121 to drive the fan at av higher rate of speed.

I desire to state that my structure can be considerably modified in its details without departing from my invention. I wish to claim the same in the specific form illustrated and also to claim the same broadly as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a furnace structure, the combination of the furnace with its radiator, the furnace casing therefor, said radiator being spaced from said casing whereby air may flow therebetween, a breast top for the casing with distribution pipes connected thereto, a conically depressed top wall, an annular partiti on extending inwardly from the breast top, said partition having a central opening at the top of the furnace beneath said distribution pipes, said breast top, top wall and partition forming a distribution chamber, a fan having a vertical shaft disposed above said central opening, the blades of which project laterally into the distribution chamber, and overlap the annular partition and a supporting bearing for said fan shaft disposed on the furnace top, and means to drive said fan, the parts being so disposed and arranged that the upperpart of the furnace casing constitutes a fan casing and the said annular partition the lower side of said fan casing with a central intake whereby the fan draws air over the radiator and distributes it axially and radially outward through the distribution pipes.

2. In a furnace structure, the combina tion of the furnace with its radiator, the furnace casing therefor, said radiator and said casing having a space therebetween for the passage of air, a breast top for the easing with distribution pipes connected thereto, a top wall, an annular inwardly and upwardly extending partition with a central opening at the top of the furnace beneath said distribution pipes, a supporting bearing for said fan shaft disposed on the furnace top, said bearing maintaining the fan in a horizontal plane, said fan being entirely above a plane passing through the said central opening whereby air may be freely thrown radially outward and means to drive said fan, the parts being so disposed and arranged that the upper part of the furnace casing constitutes a fan casing and the said annular partition the lower side of said fan easing with a central intake whereby the fan draws air over the heating elements and distributes it radially outward through the Warm air pipes.

In witness whereof I have hereunto set my hand.

OSCAR P. NYSTROM. 

